evec.c File Reference

#include <xinu.h>
#include <stdio.h>

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Functions
int32	initintc ()
void	irq_dispatch ()
int32	set_evec (uint32 xnum, uint32 handler)
void	userret (void)
	プロセスが最上位の関数に戻る時に呼ばれる。現在のプロセスを終了させる。 More...

Variables
char	expmsg1 [] = "Unhandled exception. Link Register: 0x%x"
char	expmsg2 [] = "**** EXCEPTION ****"
uint32	intc_vector [128]

Function Documentation

initintc()

int32 initintc

(

void

)

Definition at line 18 of file evec.c.

References INTC_SYSCONFIG_SOFTRESET, INTC_SYSSTATUS_RESETDONE, OK, intc_csreg::sysconfig, and intc_csreg::sysstatus.

Referenced by platinit().

{
    struct  intc_csreg *csrptr = (struct intc_csreg *)0x48200000;

    /* Reset the interrupt controller */

    csrptr->sysconfig |= (INTC_SYSCONFIG_SOFTRESET);

    /* Wait until reset is complete */

    while((csrptr->sysstatus & INTC_SYSSTATUS_RESETDONE) == 0);

    return OK;
}

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irq_dispatch()

void irq_dispatch

(

)

Definition at line 72 of file evec.c.

References intc_csreg::control, currpid, DEFER_START, DEFER_STOP, disable(), INTC_CONTROL_NEWIRQAGR, intc_vector, kprintf(), panic(), proctab, resched_cntl(), intc_csreg::sir_irq, and trap().

{
    struct  intc_csreg *csrptr = (struct intc_csreg *)0x48200000;
    uint32  xnum;       /* Interrupt number of device   */
    interrupt (*handler)(); /* Pointer to handler function  */

    /* Get the interrupt number from the Interrupt controller */

    xnum = csrptr->sir_irq & 0x7F;

    /* Defer scheduling until interrupt is acknowledged */

    resched_cntl(DEFER_START);

    /* If a handler is set for the interrupt, call it */

    if(intc_vector[xnum]) {
        handler = ( interrupt(*)() )intc_vector[xnum];
        handler(xnum);
    }

    /* Acknowledge the interrupt */

    csrptr->control |= (INTC_CONTROL_NEWIRQAGR);

    /* Resume scheduling */

    resched_cntl(DEFER_STOP);
}

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set_evec()

int32 set_evec	(	uint32	xnum,
		uint32	handler
	)

Definition at line 37 of file evec.c.

References intc_csreg::banks, intc_vector, intc_bank::mir, OK, and SYSERR.

Referenced by clkinit(), ethinit(), gpioinit(), and ttyinit().

{
    struct  intc_csreg *csrptr = (struct intc_csreg *)0x48200000;
    uint32  bank;   /* bank number in int controller    */
    uint32  mask;   /* used to set bits in bank     */

    /* There are only 127 interrupts allowed 0-126 */

    if(xnum > 127) {
        return SYSERR;
    }

    /* Install the handler */

    intc_vector[xnum] = handler;

    /* Get the bank number based on interrupt number */

    bank = (xnum/32);

    /* Get the bit inside the bank */

    mask = (0x00000001 << (xnum%32));

    /* Reset the bit to enable that interrupt number */

    csrptr->banks[bank].mir &= (~mask);

    return OK;
}

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userret()

void userret

(

void

)

プロセスが最上位の関数に戻る時に呼ばれる。現在のプロセスを終了させる。

Note

プロセス作成時に、戻りアドレスとしてuserret()がスタックに積まれる。

Definition at line 11 of file userret.c.

References getpid(), and kill().

{
    kill(getpid()); /* Force process to exit */
}

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Variable Documentation

expmsg1

char expmsg1[] = "Unhandled exception. Link Register: 0x%x"

Definition at line 12 of file evec.c.

expmsg2

char expmsg2[] = "**** EXCEPTION ****"

Definition at line 13 of file evec.c.

intc_vector

uint32 intc_vector[128]

Definition at line 11 of file evec.c.

Referenced by irq_dispatch(), and set_evec().